<p>The purpose of synchronization is to ensure that only one thread executes a given block of code at a time. There’s no real problem with marking
<code>writeObject</code> <code>synchronized</code>, but it’s highly suspicious if this serialization-related method is the only
<code>synchronized</code> code in a <code>class</code>.</p>
<h2>Noncompliant Code Example</h2>
<pre>
public class RubberBall {

  private Color color;
  private int diameter;

  public RubberBall(Color color, int diameter) {
    // ...
  }

  public void bounce(float angle, float velocity) {
    // ...
  }

  private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Noncompliant
    // ...
  }
}
</pre>
<h2>Compliant Solution</h2>
<pre>
public class RubberBall {

  private Color color;
  private int diameter;

   public RubberBall(Color color, int diameter) {
    // ...
  }

  public void bounce(float angle, float velocity) {
    // ...
  }

  private void writeObject(ObjectOutputStream stream) throws IOException {
    // ...
  }
}
</pre>

